package junit.framework;

import java.util.List;

import org.junit.Ignore;
import org.junit.runner.Describable;
import org.junit.runner.Description;
import org.junit.runner.Request;
import org.junit.runner.Runner;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.Filterable;
import org.junit.runner.manipulation.NoTestsRemainException;
import org.junit.runner.manipulation.Sortable;
import org.junit.runner.manipulation.Sorter;

public class JUnit4TestAdapter implements Test, Filterable, Sortable, Describable {
	private final Class<?> fNewTestClass;

	private final Runner fRunner;

	private final JUnit4TestAdapterCache fCache;

	public JUnit4TestAdapter(Class<?> newTestClass) {
		this(newTestClass, JUnit4TestAdapterCache.getDefault());
	}

	public JUnit4TestAdapter(final Class<?> newTestClass, JUnit4TestAdapterCache cache) {
		fCache = cache;
		fNewTestClass = newTestClass;
		fRunner = Request.classWithoutSuiteMethod(newTestClass).getRunner();
	}

	@Override
	public int countTestCases() {
		return fRunner.testCount();
	}

	@Override
	public void run(TestResult result) {
		fRunner.run(fCache.getNotifier(result, this));
	}

	// reflective interface for Eclipse
	public List<Test> getTests() {
		return fCache.asTestList(getDescription());
	}

	// reflective interface for Eclipse
	public Class<?> getTestClass() {
		return fNewTestClass;
	}

	@Override
	public Description getDescription() {
		Description description = fRunner.getDescription();
		return removeIgnored(description);
	}

	private Description removeIgnored(Description description) {
		if (isIgnored(description))
			return Description.EMPTY;
		Description result = description.childlessCopy();
		for (Description each : description.getChildren()) {
			Description child = removeIgnored(each);
			if (!child.isEmpty())
				result.addChild(child);
		}
		return result;
	}

	private boolean isIgnored(Description description) {
		return description.getAnnotation(Ignore.class) != null;
	}

	@Override
	public String toString() {
		return fNewTestClass.getName();
	}

	@Override
	public void filter(Filter filter) throws NoTestsRemainException {
		filter.apply(fRunner);
	}

	@Override
	public void sort(Sorter sorter) {
		sorter.apply(fRunner);
	}
}